F 150 4WD V8-5.4L Flex Fuel (2008)
AB3-AB4
Tests AC: The Trailer Lamps Are On Continuously
PINPOINT TEST AC: THE TRAILER LAMPS ARE ON CONTINUOUSLY
Normal Operation
The parking lamps are controlled by the trailer tow parking lamp relay. When the trailer tow parking lamp relay is energized, voltage is routed from
the central junction box (CJB) to the trailer tow connector through circuit 962 (BN/WH).
The reversing lamps are controlled by the trailer tow reversing lamp relay. When the trailer tow reversing lamp relay is energized, voltage is routed
from the central junction box (CJB) to the trailer tow connector through circuit 140 (BK/PK).
The trailer tow reversing lamp relay is integral to the CJB and not removable.
This pinpoint test is intended to diagnose the following:
-
Wiring, terminals or connectors
-
Trailer tow parking lamp relay
-
CJB
-
Trailer
